You can think of most common languages as "lossless" (at least in comparison), whereas Toki Pona is "lossy". Once you translate English to Toki, it loses a lot of granularity. For example...
Translating English to Toki Pona:
Talk -> Toki
Translating Toki Pona to English: Toki -> To speak, Communicate, Use language, Think, Say "hello"
Which means, it's now impossible to translate it back to English and know which one is referred to, without context.
The language forces you to be less specific in your meaning, but also to focus on core human emotions instead of unnecessary complexity. Having a translator perfectly convert English to Toki Tona is gonna be a lot easier than the reverse, anyway, unless you have a lot of context to piece it together.
Note: I tried learning this language many years ago and this is my personal opinion. It may not be shared by everyone.
Translating English to Toki Pona:
Translating Toki Pona to English: Which means, it's now impossible to translate it back to English and know which one is referred to, without context.The language forces you to be less specific in your meaning, but also to focus on core human emotions instead of unnecessary complexity. Having a translator perfectly convert English to Toki Tona is gonna be a lot easier than the reverse, anyway, unless you have a lot of context to piece it together.
Note: I tried learning this language many years ago and this is my personal opinion. It may not be shared by everyone.